212391487 has 8 divisors (see below), whose sum is σ = 264799872. Its totient is φ = 165499800.

The previous prime is 212391467. The next prime is 212391493. The reversal of 212391487 is 784193212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212391487 - 2¹⁵ = 212358719 is a prime.

It is a super-2 number, since 2×212391487² = 90220287500142338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212391437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1379089 + ... + 1379242.

It is an arithmetic number, because the mean of its divisors is an integer number (33099984).

Almost surely, 2^212391487 is an apocalyptic number.

212391487 is a deficient number, since it is larger than the sum of its proper divisors (52408385).

212391487 is a wasteful number, since it uses less digits than its factorization.

212391487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758349.

The product of its digits is 24192, while the sum is 37.

The square root of 212391487 is about 14573.6572966431. The cubic root of 212391487 is about 596.6400034207.

It can be divided in two parts, 212391 and 487, that added together give a triangular number (212878 = T₆₅₂).

The spelling of 212391487 in words is "two hundred twelve million, three hundred ninety-one thousand, four hundred eighty-seven".